Commutator for magneto-electric machines



(No Model.) -A. H. EDDY.

y CCMMTATOR ECE MACNETC ELECTRIC MACHINES. No. 257,566. Patented May9,1882.

UNITED STATES PATENT OFFICE.

ARTHUR Il. EDDY, OF HARTFORD, CONNECTICUT.

COMMUTATOR FOR MAGNETO-ELECTRlC MACHINES.

SPECIFICATION forming part of Letters Patent No. 257,566, dated May 9,1882.

A pplicniion liled February l0, 1882.

T 0 all whom it may concern:

Be it known that I, ARTHUR H. EDDY, ot' Hartford, in the county ofHartford and State 'of Connecticut, have invented certain new and usefulImprovements in Oom in utators for Magneto-Electric Machines, ot' whichthe i'ollowin g is a specification.

Myinvention relates to com 1n utators for ma gnet0-electric machines inwhich open and unobstructed spaces extend transversely through thecommntator, and in which the parts are constructed and puttogetherin apeculiar manner; and the objects of my improvements are to so constructthe parts that they shall be very firm and substantial, while at thesame time they may be produced at a less cost than formerly, and toarrange the screws which hold the copper strips in place, so that theycan be conveniently removed alter the strips are worn out. I attainthese objects bythe mechanism illustrated in the accompanying drawings,in which- Figure l is a perspective view. Fig. 2 is a longitudinalsection. Fig. 3 is a transverse seetion on the line r ot' Fig.2, andFig. et is a detached transverse section, partly in elevation.

B designates a recessed head formed on the end of sleeve O, whichrevolves with and is mounted on the shaft D, Fig. 2. Said shaft is shownas broken off, but it may be extended to any desired length. Thecommntator strips areformed oftwo parts-the body E, preferably of toughwhite-metal, and the wearing-plates a, ot" copper. The inner ends ot'the bodies are shouldered upon the inside, as shown at l), Figs. 2 and4, and they are also provided with the usual rods, c, firmly securedthereto, and extending, when in place, through holes in the sleeve C.The confronting sides of the body E and wearing-plate a of each stripare made flat, as shown most clearly in Fig. 4, instead of being on thearc ot a circle. The screws el, which hold said parts together, are madewith quite a long head having a deep slot, and are sunk Well into theplates a, so that as the plates, together with the screw-heads, wearaway to such an extentthat the plates are substantially worn out, asindicated by the curved broken line in Fig. 4, there will still be asufficient portion of the slotted screw-head left to enable the screwsto be readily removed with an ordinary screw-driver preparatory to remov(No model.)

ing the plates and replacing them with new ones.

The wearing-platesafdo notextend the whole length of the bodies E, butstop a little short of the sleeve G, as shown. The sides of the bodiesof these strips are formed on radial lines, as most clearly shown inFig. 3, and that portion of them which receives the plates et is made ofa little less thickness than is the portion which enters the head B.After the parts are thus formed the ends of the strips E t are puttogether with paper c, Fig. 3, or other proper insulator, between theseveral strips, which, when taken collectively, are of a cylindricalform, and ot' a size which will substantially Alill the recess in thehead B. The bottoin ofthe recess has an insulatorin the forni et' aperforated diskhf, Fig. 2, placed in it, and another insulator, g, Figs.2 and 3, encircles all of the strips. They are then forced into therecess in the head B, as shown, with suliicient force to make them stayfirmly in place. A bolt, F, the body of which is insulated, is thenscrewed into the shaft D, with its head resting upon the shoulders b, tofurther secure the strips in place. This construction leaves the mainportion of the commntator hollow and free from all axial obstructions,while the strips are disconnected, so as to leave open an d unobstructedspaces extending transversely through the commntator for the wholelengthofthe wearing-plates,against which thebrushes bear, so that thecommntator maybe very conveniently cleaned every day without taking itapart. The spaces between the strips can be cleaned by passing a stringor wire, A, back and forth through said spaces, as shown in Fig. 1.

I do not claim as my invention a commutator having the open unobstructedspaces between its strips extending from side to side and across itsaxis, as the saine was previously invented by another, but ot' adifferent construction from that herein shown aud described, except inits general form and in the particular herein disclaimed.

I claim as my inventionl. In a commntator, the combination of theseveral insulated strips and the recessed head, into which they areforced and by which they are held together, substantially as described,and for the purpose specified.

2. In a commntator, the combination of the IOG recessed head, theseveral strips having the ay nearly to the Hat side of' said strip,substanshoulder b, the bolt F, and shaft D, substzmtially :1s described,and for the purpose specixo tiaiiy as described, and for the purposespeeified. ed.`

5 3. In :L eommutator-strip, the body E and v wearing-plate a, havingtheir confronting sides Witnesses:

ARTHUR H. EDDY.

made Het, as shown, and having the head of JAMES SHEPARD, thedeeply-slotted screw d sunk into the strip JOHN EDWARDS, Jr.

